- A
Global unicast address
Why wrong: Global unicast addresses are routable on the internet and require assignment from an address range or DHCPv6, they are not automatically generated without configuration.
- B
Unique local address
Why wrong: Unique local addresses (fc00::/7) are analogous to IPv4 private addresses and require administrative assignment, not automatic generation on interface initialization.
- C
Link-local address
Link-local addresses (fe80::/10) are automatically created when an IPv6 interface is enabled, using methods like EUI-64 or privacy extensions.
- D
Multicast address
Why wrong: Multicast addresses (ff00::/8) are not assigned to interfaces as unicast addresses; they are used for group communication.
Question 267 of 520
N10-009 Networking Concepts Practice Question
This N10-009 practice question tests your understanding of networking concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer is configuring a network and needs to understand the default behavior of an IPv6 node. When an IPv6 interface is initialized, which type of address is automatically assigned without any configuration server?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Link-local address
When an IPv6 interface is initialized, it automatically generates a link-local address (fe80::/10) using Stateless Address Autoconfiguration (SLAAC) without requiring any external server (e.g., DHCPv6). This address is mandatory for neighbor discovery and other link-local communication, allowing the node to operate on the local network segment immediately.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Global unicast address
Why it's wrong here
Global unicast addresses are routable on the internet and require assignment from an address range or DHCPv6, they are not automatically generated without configuration.
When this WOULD be correct
In a scenario where an IPv6 node is configured with a static global unicast address or receives one via DHCPv6 prefix delegation, and the question asks for the address type used for global reachability, global unicast would be correct.
- ✗
Unique local address
Why it's wrong here
Unique local addresses (fc00::/7) are analogous to IPv4 private addresses and require administrative assignment, not automatic generation on interface initialization.
When this WOULD be correct
A question asking which IPv6 address type is designed for local communication within a site, is not globally routable, and can be used without a global prefix assignment (e.g., 'Which address type is analogous to IPv4 private addresses?').
- ✓
Link-local address
- ✗
Multicast address
Why it's wrong here
Multicast addresses (ff00::/8) are not assigned to interfaces as unicast addresses; they are used for group communication.
When this WOULD be correct
When asked which address type is used for one-to-many communication in IPv6, or which address is assigned to a multicast group that all IPv6 nodes must join (e.g., FF02::1).
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓Link-local addressCorrect answer▾
Why this is correct
Link-local addresses (fe80::/10) are automatically created when an IPv6 interface is enabled, using methods like EUI-64 or privacy extensions.
✗Global unicast addressWrong answer — click to see why▾
Why this is wrong here
Global unicast addresses require either manual configuration or DHCPv6 (stateful or stateless) to be assigned; they are not automatically generated upon interface initialization without a configuration server.
★ When this WOULD be the correct answer
In a scenario where an IPv6 node is configured with a static global unicast address or receives one via DHCPv6 prefix delegation, and the question asks for the address type used for global reachability, global unicast would be correct.
Why candidates choose this
Candidates may confuse the automatic generation of link-local addresses with the ability to form global addresses via SLAAC, but SLAAC still requires router advertisements, not automatic assignment without any server.
✗Unique local addressWrong answer — click to see why▾
Why this is wrong here
Unique local addresses (ULAs) are not automatically assigned upon interface initialization; they require manual configuration or DHCPv6. IPv6 nodes automatically generate a link-local address (fe80::/10) without any server.
★ When this WOULD be the correct answer
A question asking which IPv6 address type is designed for local communication within a site, is not globally routable, and can be used without a global prefix assignment (e.g., 'Which address type is analogous to IPv4 private addresses?').
Why candidates choose this
Candidates may confuse unique local addresses with link-local addresses because both are for local use, but ULAs are not automatically assigned and require configuration, unlike link-local addresses.
✗Multicast addressWrong answer — click to see why▾
Why this is wrong here
A multicast address is not automatically assigned to an interface upon initialization; it is typically joined for specific protocols (e.g., all-nodes multicast FF02::1) but not generated as a unicast address for the interface itself.
★ When this WOULD be the correct answer
When asked which address type is used for one-to-many communication in IPv6, or which address is assigned to a multicast group that all IPv6 nodes must join (e.g., FF02::1).
Why candidates choose this
Candidates may confuse the automatic joining of the all-nodes multicast group with the automatic assignment of a unicast address, or think that multicast addresses are generated similarly to link-local addresses.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The N10-009 exam often tests the misconception that a global unicast address is automatically assigned, but the trap here is that only the link-local address is generated by default, while global and unique local addresses require additional configuration or router presence.
Detailed technical explanation
How to think about this question
The link-local address is derived from the interface's MAC address using the EUI-64 format (or a randomly generated identifier per RFC 7217 for privacy), combined with the fe80::/10 prefix. This address is essential for Neighbor Discovery Protocol (NDP) operations such as Duplicate Address Detection (DAD) and router solicitation, and it remains active even if no global or unique local address is configured. In real-world scenarios, a misconfigured router advertisement can cause a node to fail to obtain a global address, but the link-local address always works for local troubleshooting (e.g., pinging fe80::1).
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this N10-009 question test?
Networking Concepts — This question tests Networking Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Link-local address — When an IPv6 interface is initialized, it automatically generates a link-local address (fe80::/10) using Stateless Address Autoconfiguration (SLAAC) without requiring any external server (e.g., DHCPv6). This address is mandatory for neighbor discovery and other link-local communication, allowing the node to operate on the local network segment immediately.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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